/*
* low_level_input(): Should allocate a pbuf and transfer the bytes of the
* incoming packet from the interface into the pbuf.
*/
static struct pbuf *low_level_input( struct netif *netif )
{
struct pbuf *p = NULL, *q;
u16_t len = 0;
static SemaphoreHandle_t xRxSemaphore = NULL;
/* Parameter not used. */
( void ) netif;
if( xRxSemaphore == NULL )
{
vSemaphoreCreateBinary( xRxSemaphore );
}
/* Access to the emac is guarded using a semaphore. */
if( xSemaphoreTake( xRxSemaphore, netifGUARD_BLOCK_TIME ) )
{
/* Obtain the size of the packet. */
len = ulEMACInputLength();
if( len )
{
#if ETH_PAD_SIZE
len += ETH_PAD_SIZE; /* allow room for Ethernet padding */
#endif
/* We allocate a pbuf chain of pbufs from the pool. */
p = pbuf_alloc( PBUF_RAW, len, PBUF_POOL );
if( p != NULL )
{
#if ETH_PAD_SIZE
pbuf_header( p, -ETH_PAD_SIZE ); /* drop the padding word */
#endif
/* Let the driver know we are going to read a new packet. */
vEMACRead( NULL, 0, len );
/* We iterate over the pbuf chain until we have read the entire
packet into the pbuf. */
for( q = p; q != NULL; q = q->next )
{
/* Read enough bytes to fill this pbuf in the chain. The
available data in the pbuf is given by the q->len variable. */
vEMACRead( q->payload, q->len, len );
}
#if ETH_PAD_SIZE
pbuf_header( p, ETH_PAD_SIZE ); /* reclaim the padding word */
#endif
#if LINK_STATS
lwip_stats.link.recv++;
#endif /* LINK_STATS */
}
else
{
#if LINK_STATS
lwip_stats.link.memerr++;
lwip_stats.link.drop++;
#endif /* LINK_STATS */
}
}
xSemaphoreGive( xRxSemaphore );
}
return p;
}
/**
* Should allocate a pbuf and transfer the bytes of the incoming
* packet from the interface into the pbuf.
*
* @param netif the lwip network interface structure for this ethernetif
* @return a pbuf filled with the received packet (including MAC header)
* NULL on memory error
*/
static struct pbuf *
low_level_input(struct netif *netif)
{
//struct ethernetif *ethernetif = netif->state;
/* MakingThings: Initialized p */
struct pbuf *p = NULL;
struct pbuf *q;
/* MakingThings: Initialized len */
u16_t len = 0;
/* MakingThings: Add for FreeRTOS */
static xSemaphoreHandle xRxSemaphore = NULL;
/* Parameter not used. */
( void ) netif;
/* MakingThings: Add for FreeRTOS */
if( xRxSemaphore == NULL )
{
vSemaphoreCreateBinary( xRxSemaphore );
}
/* Access to the emac is guarded using a semaphore. */
if( xSemaphoreTake( xRxSemaphore, netifGUARD_BLOCK_TIME ) )
{
/* Obtain the size of the packet. */
len = ulEMACInputLength();
if( len )
{
#if ETH_PAD_SIZE
len += ETH_PAD_SIZE; /* allow room for Ethernet padding */
#endif
/* We allocate a pbuf chain of pbufs from the pool. */
p = pbuf_alloc(PBUF_RAW, len, PBUF_POOL);
if (p != NULL) {
#if ETH_PAD_SIZE
pbuf_header(p, -ETH_PAD_SIZE); /* drop the padding word */
#endif
/* MakingThings: Added */
/* Let the driver know we are going to read a new packet. */
vEMACRead( NULL, 0, len );
/* We iterate over the pbuf chain until we have read the entire
* packet into the pbuf. */
for(q = p; q != NULL; q = q->next) {
/* Read enough bytes to fill this pbuf in the chain. The
* available data in the pbuf is given by the q->len
* variable. */
// read data into(q->payload, q->len);
vEMACRead( q->payload, q->len, len );
}
// MakingThings: for FreeRTOS - nope
// acknowledge that packet has been read();
#if ETH_PAD_SIZE
pbuf_header(p, ETH_PAD_SIZE); /* reclaim the padding word */
#endif
LINK_STATS_INC(link.recv);
} else {
//drop packet();
LINK_STATS_INC(link.memerr);
LINK_STATS_INC(link.drop);
}
}
xSemaphoreGive( xRxSemaphore );
}
return p;
}
